the link you posted is to a heat sink with mounting holes for a 100W or 200W kit... I don't see the kit you're referring to. Here's a 100W discrete power amp they sell for $29.. It shows a heat sink but doesn't mention if it's included.. I would hope so, but who knows
http://store.qkits.com/moreinfo.cfm/FK666
Some of the kits they sell are from futurekit (any that have a part number starting with FK) so you can actually find rough schematics of the circuits online. Most component values are deleted (resistors, caps, etc..) but you can at least get a feel for the topology of the circuit. Here's the schematic for that 100W kit: http://www.futurekit.com/basic_elec/FK666E-1.pdf
Edit: Ok, I see the amp kit now.. Yeah, that does look like a decent deal. You can even buy it fully assembled and ready to go for $69. It seems the kit has the power supply built right in. While its nice that you don't have to build your own it doesn't appear that there are any DC taps after the rectifiers so you would have to create a separate power supply for your preamp circuit. You could use the same AC taps but would need to rectify the AC and regulate it down to your desired voltage.
Here's the full assembly manual for the kit: http://www.vellemanusa.com/downloads/0/illustrated/illustrated_assembly_manual_k8060_rev1.pdf
I have to say the connection between the darlington output transistors and the board is kind of sketchy... They use a standard .1" pin header and solder the pins of the transistor between the pins of the header... really?? At least the manual includes a full schematic so maybe one of our more experienced readers could comment on the topology of the amp.. if it will deliver the quoted performance.
-Matt
http://store.qkits.com/moreinfo.cfm/FK666
Some of the kits they sell are from futurekit (any that have a part number starting with FK) so you can actually find rough schematics of the circuits online. Most component values are deleted (resistors, caps, etc..) but you can at least get a feel for the topology of the circuit. Here's the schematic for that 100W kit: http://www.futurekit.com/basic_elec/FK666E-1.pdf
Edit: Ok, I see the amp kit now.. Yeah, that does look like a decent deal. You can even buy it fully assembled and ready to go for $69. It seems the kit has the power supply built right in. While its nice that you don't have to build your own it doesn't appear that there are any DC taps after the rectifiers so you would have to create a separate power supply for your preamp circuit. You could use the same AC taps but would need to rectify the AC and regulate it down to your desired voltage.
Here's the full assembly manual for the kit: http://www.vellemanusa.com/downloads/0/illustrated/illustrated_assembly_manual_k8060_rev1.pdf
I have to say the connection between the darlington output transistors and the board is kind of sketchy... They use a standard .1" pin header and solder the pins of the transistor between the pins of the header... really?? At least the manual includes a full schematic so maybe one of our more experienced readers could comment on the topology of the amp.. if it will deliver the quoted performance.
-Matt